Online CSS optimizer tool
When you decide to optimize your CSS file, you can choose “Optimize CSS via URI” (online file), “Optimize CSS via File Upload” (CSS from your computer) or “Optimize CSS via Direct Input” (by copy/paste file into an online form). You can also choose if you want a CSS optimizer to remove line breaks in your file or not.
Firebug-webmasters a must tool
Seomoz SEO tools collection
TermExtractor analyzes the content of a given page and extracts the terms that seem to be targeted at search engines. CrawlTest discovers the problems search engine bots run into while crawling your website. The HTTP response codes your page return, cache dates, title tags and much more. GeoTarget determines how well a site is targeted to region-specific search engines.